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        1到6总共6个标题标签
        <h1>在学HTML,haha</h1> 
        <h3>在学HTML,haha</h3> 
        <h6>在学HTML,haha</h6>
        <i>斜体标签i</i>
        <p> 分割线标签hr<hr> </p>
        <p>段落标签p</p>
        <p><b> 粗体标签&nbsp;b </b></p>

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